CN110460238A - A kind of decoupling control method and device of the DAB converter of input series and output parallel - Google Patents
A kind of decoupling control method and device of the DAB converter of input series and output parallel Download PDFInfo
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- CN110460238A CN110460238A CN201910735656.0A CN201910735656A CN110460238A CN 110460238 A CN110460238 A CN 110460238A CN 201910735656 A CN201910735656 A CN 201910735656A CN 110460238 A CN110460238 A CN 110460238A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the decoupling control method and device of a kind of DAB converter of input series and output parallel, N number of identical DAB converter output series connection output-parallel obtains the first phase shift ratio D by input Pressure and Control and output voltage control respectivelyiWith the second phase shift ratio De；First phase shift ratio DiWith the second phase shift ratio DeThe control sequential between switching tube driving pulse sequence is obtained by phase shifting control；Switch control signal with control sequential is input to the control terminal of each switching device Q1~Q4 of transformer primary side H1 of DAB converter, each switching device Q5~Q8 of Circuit Fault on Secondary Transformer H2, completes control process.Two phase shifting control freedom degrees that the decoupling control method of the DAB converter of input series and output parallel provided by the invention passes through the dual phase shifting control using DAB converter, it is constant to be respectively used to control input pressure and output voltage, compared to traditional single phase shifting control, by increasing control freedom degree, realize full decoupled between output voltage control and input voltage Pressure and Control.
Description
Technical field
The invention belongs to the technical fields of electric power electric transformer, more particularly, to a kind of input series and output parallel
DAB converter decoupling control method and device.
Background technique
Increasingly tend to be severe along with the consumption and problem of environmental pollution of traditional fossil energy, is sent out with wind-power electricity generation, photovoltaic
Electricity be the distributed energy of representative with its feature of environmental protection, flexible, the nearest power transmission of configuration, the advantages that it is in widespread attention.Especially with
The development of smart grid, the flexible access of distributed energy and energy-storage units become the developing important goal of smart grid.
The development of DC grid can effectively solve the contradiction between distributed energy and bulk power grid, improve renewable energy in power grid system
Accounting in system gives full play to the value and benefit of distributed energy.Core of the DC solid transformer as direct-current grid
One of device realizes transformation of electrical energy by converters, overcomes the shortcomings that conventional AC send power transformation.DC converter
As the key technology in electric power electric transformer, it is largely fixed the performance of electric power electric transformer.Therefore, Gao Xing
The research of energy DC converter technology is of great significance for DC distribution net and direct-current grid development.
Double active bridge (Dual Active Bridge, the DAB) converters of isolated form are typical isolation level topological structures,
Energy can carry out transmitted in both directions, and a wide range of interior realization Sofe Switch controls flexibly, Ke Yishi in total there are three control freedom degree
Now boosting, decompression transformation.Therefore DAB converter is widely applied in DC-DC transformation.For in direct current distribution system
Commutator transformer for, for medium voltage side voltage usually in 10kV or more, secondary side is that resident's voltage is generally 400V or so.
Power semiconductor voltage class and power grid demand gap are obvious at present, are unable to satisfy the application of electric system high-power
Demand needs to realize mesohigh input by circuit topology.Therefore cascade structure is generallyd use, by low voltage low power module
It carries out input and output and is combined raising power system capacity and efficiency in series and parallel.Cascade connection type modularization DAB topology advantage includes can be with
Facilitate reduction industrial cost and time, low pressure grade by introducing redundant module to improve the standardization of reliability, device
Device is applied to high pressure occasion, and device loss is small, and transducer effciency improves and provide the possibility that multiple converters interlock output
Property, so that output ripple reduces to reduce the size of output filter.
Therefore double active bridge DAB converters of input series and output parallel can meet DC distribution net input side well
Bear the requirement of high voltage outlet side output high current.But only one control of DAB converter under traditional list phase shifting control from
It for its decoupling control is controlled by intermediate variable control amount by constructing intermediate decoupling matrices by spending.But it controls
There are still coupling between loop processed, this makes output of the input signal of each control loop in system to all circuits
Can have an impact, and the output in each circuit will receive the effect of all inputs.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of DAB of input series and output parallel transformation
The decoupling control method and device of device, it is intended to increase the degree of dependence between the control freedom degree reduction module of DAB converter.
To achieve the above object, it is an aspect of this invention to provide that providing a kind of DAB transformation of input series and output parallel
The decoupling control method of device, N number of identical DAB converter output series connection output-parallel, each DAB converter is by the first direct current
Potential source, the second DC voltage source, medium/high frequency transformer, transformer primary side H1, Circuit Fault on Secondary Transformer H2 and inductance L composition, become
Depressor primary side H1 include 4 active switching devices Q1~Q4, Circuit Fault on Secondary Transformer H2 include four active switching devices Q5~
Q8；The anode of the DC bus of transformer primary side H1 is connected with the anode of the first DC voltage source, transformer primary side H1's
The cathode of DC bus is connected with the cathode of the first DC voltage source, and the exchange side of transformer primary side H1 is by inductance L in
The primary side of high frequency transformer is connected；The positive phase of the anode and the second DC voltage source of the DC bus of Circuit Fault on Secondary Transformer H2
Even, the cathode of the DC bus of Circuit Fault on Secondary Transformer H2 is connected with the cathode of the second DC voltage source, Circuit Fault on Secondary Transformer H2's
Exchange side is connected with the secondary side of medium/high frequency transformer；The no-load voltage ratio of medium/high frequency transformer is n:1；It is characterized in that, this method includes
Following steps:
The first phase shift ratio D is obtained by input Pressure and Control and output voltage control respectivelyiWith the second phase shift ratio De；
First phase shift ratio DiWith the second phase shift ratio DeThe control between switching tube driving pulse sequence is obtained by phase shifting control
Timing；
Switch control signal with control sequential is input to each switching device Q1 of transformer primary side H1 of DAB converter
The control terminal of each switching device Q5~Q8 of~Q4, Circuit Fault on Secondary Transformer H2 completes control process.
Further, input Pressure and Control carry out Pressure and Control to the input voltage of each DAB converter, realize each DAB
The input voltage of converter is balanced.
Further, output voltage control regulates and controls the output voltage of each DAB converter, is instructing its stabilization
Value.
Further, phase shifting control generates corresponding DAB according to input Pressure and Control and output voltage control respectively and converts
The switching tube driving pulse sequence of device.
It is another aspect of this invention to provide that providing a kind of decoupling control of the DAB converter of input series and output parallel
Device, including decoupling controller and phase-shift controller, decoupling controller include input even pressure controller and output voltage controller；
Even pressure controller is inputted for exporting the first phase shift ratio Di；
Output voltage controller is for exporting the second phase shift ratio De；
Phase-shift controller is for utilizing the first phase shift ratio DiWith the second phase shift ratio DeIt obtains between switching tube driving pulse sequence
Control sequential.
Further, input even pressure controller carries out Pressure and Control to the input voltage of each DAB converter, realizes each
The input voltage of DAB converter is balanced.
Further, output voltage controller regulates and controls the output voltage of each DAB converter, is instructing its stabilization
Value.
Further, the output end of the corresponding each switch control signal of the phase-shift controller transformation with DAB converter respectively
The Circuit Fault on Secondary Transformer H2's of the input terminal and DAB converter of the control signal of active switching devices Q1~Q4 of device primary side H1
The input terminal of the control signal of active switching devices Q5~Q8 is connected.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
1, the decoupling control method of the DAB converter of input series and output parallel provided by the invention using DAB by being become
Two phase shifting control freedom degrees of the dual phase shifting control of parallel operation are respectively used to control input and press, phase constant with output voltage
Than output voltage control and input voltage Pressure and Control may be implemented by increasing control freedom degree in traditional single phase shifting control
Between it is full decoupled, realize module between do not need to interconnect；
2, the decoupling control of the decoupling control method of the DAB converter of input series and output parallel provided by the invention is point
Cloth control is inputted without intersecting without coupling between grading ring road and output voltage loop, and control loop is simpler reliable, reduces
Industrial cost and period；
3, the DAB converter of input series and output parallel provided by the invention is using input series connection and output-parallel, input
Side it is inexpensive and input side can to play it in input side using the switching device of low stress levels using cascaded structure
The performance of low switching losses, outlet side can provide low-voltage, high-current in outlet side using parallel-connection structure, and admirably adaptation is big defeated
Enter side and bears the application that big voltage output side needs high current.
Detailed description of the invention
Fig. 1 is the DAB converter topology figure of input series and output parallel provided by the invention；
Fig. 2 is the power circuit topological diagram of the DAB converter of input series and output parallel provided by the invention；
Fig. 3 is the DAB converter decoupling control schematic diagram of input series and output parallel provided by the invention；
Fig. 4 is the switching tube driving pulse sequence and work of the DAB converter of input series and output parallel provided by the invention
Make waveform diagram；
Fig. 5 is single phase shifting control block diagram of the DAB converter of existing input series and output parallel；
Fig. 6 is the dual phase shifting control block diagram of the DAB converter of input series and output parallel provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of decoupling control methods of the DAB converter of input series and output parallel, wherein such as Fig. 1
Shown, DAB unit 1 to DAB unit N is N number of identical DAB converter topology structure, and DAB unit 1 to DAB unit N is inputting
End is connected between respective input capacitance then input side in parallel respectively, and DAB unit 1 to DAB unit N is in output end point
Then output end not in parallel with respective output capacitance is in parallel, constitutes the cascade connection type transformer configuration of input series and output parallel.
Fig. 2 show the power circuit topological diagram of the DAB converter of input series and output parallel provided by the invention, DAB
Converter is by the first DC voltage source, the second DC voltage source, medium/high frequency transformer, transformer primary side H1, transformer secondary
Side H2 and inductance L composition, transformer primary side H1 include 4 active switching devices Q1~Q4, and Circuit Fault on Secondary Transformer H2 includes four
A active switching devices Q5~Q8；The positive phase of the anode and the first DC voltage source of the DC bus of transformer primary side H1
Even, the cathode of the DC bus of transformer primary side H1 is connected with the cathode of the first DC voltage source, transformer primary side H1's
Exchange side is connected by inductance L with the primary side of medium/high frequency transformer；The anode and second of the DC bus of Circuit Fault on Secondary Transformer H2
The anode of DC voltage source is connected, the cathode phase of the cathode of the DC bus of Circuit Fault on Secondary Transformer H2 and the second DC voltage source
Even, the exchange side of Circuit Fault on Secondary Transformer H2 is connected with the secondary side of medium/high frequency transformer；The no-load voltage ratio of medium/high frequency transformer is n:1.
Decoupling control method is as shown in Figure 3, comprising the following steps:
The first phase shift ratio D is obtained by input Pressure and Control and output voltage control respectivelyiWith the second phase shift ratio De；
First phase shift ratio DiWith the second phase shift ratio DeThe control between switching tube driving pulse sequence is obtained by phase shifting control
Timing；
Switch control signal with control sequential is input to each switching device Q1 of transformer primary side H1 of DAB converter
The control terminal of each switching device Q5~Q8 of~Q4, Circuit Fault on Secondary Transformer H2 completes control process.
Specifically, the zero level of output voltage of first phase shift than being embodied in primary side H-bridge circuit and secondary side H-bridge circuit
Accounting be Di, the shifting between primary side H-bridge circuit and secondary side H-bridge circuit is comparably De.
Fig. 4 is each switch control signal schematic diagram of the DAB converter of input series and output parallel provided by the invention, G1
~G8 is the driving signal of switching tube Q1~Q8, and wherein Q1 and Q2 complementation is connected, Q3 and Q4 complementation conducting, Q5 and Q6, Q7 and Q8
It is also complementary conducting.ThsFor half of switch periods.uh1、uh2Respectively H1 exchanges side voltage, u with H2LFor inductive drop, iLFor
Inductive current.According to the switching sequence of dual phase shift, a switch periods of DAB converter can be divided into 8 stage t0~t8。
According to the relationship of DAB converter voltage and current under dual phase shift, i-th of DAB converter can be derived
Transimission power expression formula, expression formula are the function of the first phase shift ratio Di and the second phase shift ratio De:
Pi=f (Dii,Dei)
In conjunction with Fig. 4 as can be seen that by adjusting the first phase shift ratio Di and the adjustable DAB converter of the second phase shift ratio De
Transimission power, and then adjust output voltage and input voltage.
Decoupling control Fig. 5 institute by taking the input series and output parallel structure of three modules as an example, in tradition list phase shifting control
Show.Input even pressure controller G1With output voltage controller G2The shifting ratioing signal D between two H bridges can only all be acted one, lead to
A control freedom degree is crossed to realize two control targets.Wherein x1, x2, x3For intermediate variable, respectively by two even pressure controllers
G1An and output voltage-stabilizing controller G2It generates.Although intermediate variable x1, x2, x3Between realize decoupling control, but couple most
It can be reflected in control loop and control amount eventually.Therefore the decoupling control is not fully.
The full decoupled control block diagram of input series and output parallel system under dual phase shifting control proposed in the present invention
As shown in Figure 6.Wherein first move ratioing signal DiBy input even pressure controller G1It generates, second moves ratioing signal DeBy output electricity
Pressure controller G2It generates.Full decoupled control is realized between two control targets in control loop.Wherein G1、G2It is PI
Controller.
The input of i-th of DAB unit presses the input of PI controller for the sampled value of the input voltage of i-th of DAB unit
ViniWith N number of module input voltage average value VavgDeviation, through PI controller adjust generate first move ratioing signal Di.And own
The output voltage PI controller of DAB unit be it is same, input be N number of DAB unit parallel output voltage VoIt is referred to it
Value VorefDeviation, through PI controller adjust generate second move ratioing signal De。
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of decoupling control method of the DAB converter of input series and output parallel, N number of identical DAB converter output string
Join output-parallel, the DAB converter is by the first DC voltage source, the second DC voltage source, medium/high frequency transformer, transformer one
Secondary side H1, Circuit Fault on Secondary Transformer H2 and inductance L composition, the transformer primary side H1 include 4 active switching devices Q1~Q4,
Circuit Fault on Secondary Transformer H2 includes four active switching devices Q5~Q8；The DC bus of the transformer primary side H1 anode with
The anode of first DC voltage source is connected, the cathode of the DC bus of transformer primary side H1 and the cathode of the first DC voltage source
It is connected, the exchange side of transformer primary side H1 is connected by inductance L with the primary side of medium/high frequency transformer；The Circuit Fault on Secondary Transformer
The DC bus of H2 anode be connected with the anode of the second DC voltage source, the cathode of the DC bus of Circuit Fault on Secondary Transformer H2 and
The cathode of second DC voltage source is connected, and the exchange side of Circuit Fault on Secondary Transformer H2 is connected with the secondary side of medium/high frequency transformer；It is described
The no-load voltage ratio of medium/high frequency transformer is n:1；It is characterized in that, method includes the following steps:
The first phase shift ratio D is obtained by input Pressure and Control and output voltage control respectivelyiWith the second phase shift ratio De；
The first phase shift ratio DiWith the second phase shift ratio DeThe control between switching tube driving pulse sequence is obtained by phase shifting control
Timing；
The switch control signal with control sequential is input to each switching device Q1 of transformer primary side H1 of DAB converter
The control terminal of each switching device Q5~Q8 of~Q4, Circuit Fault on Secondary Transformer H2 completes control process.
2. decoupling control method according to claim 1, which is characterized in that the input Pressure and Control are by adjusting first
Phase shift ratio Di carries out Pressure and Control to the input voltage of each DAB converter, realizes that the input voltage of each DAB converter is balanced.
3. decoupling control method according to claim 1, which is characterized in that the output voltage control is by adjusting second
Phase shift ratio De regulates and controls the output voltage of each DAB converter, stablizes it in instruction value.
4. decoupling control method according to claim 1, which is characterized in that the phase shifting control is pressed according to input respectively
Control and output voltage control generate the switching tube driving pulse sequence of corresponding DAB converter.
5. a kind of decoupling control device of the DAB converter of input series and output parallel, which is characterized in that including decoupling controller
And phase-shift controller, the decoupling controller include input even pressure controller and output voltage controller；
The input even pressure controller is for exporting the first phase shift ratio Di；
The output voltage controller is for exporting the second phase shift ratio De；
The phase-shift controller is for utilizing the first phase shift ratio DiWith the second phase shift ratio DeObtain switching tube driving pulse sequence
Column.
6. decoupling control device according to claim 5, which is characterized in that the input even pressure controller becomes each DAB
The input voltage of parallel operation carries out Pressure and Control, realizes that the input voltage of each DAB converter is balanced.
7. decoupling control device according to claim 5, which is characterized in that the output voltage controller becomes each DAB
The output voltage of parallel operation is regulated and controled, and stablizes it in instruction value.
8. decoupling control device according to claim 5, which is characterized in that the corresponding each switch control of the phase-shift controller
The output end of signal processed respectively with the control signal of active switching devices Q1~Q4 of the transformer primary side H1 of DAB converter
Input terminal is connected with the input terminal of the control signal of active switching devices Q5~Q8 of the Circuit Fault on Secondary Transformer H2 of DAB converter.
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Cited By (4)
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| CN112117784A (en) * | 2020-08-28 | 2020-12-22 | 上海交通大学 | Operation control method of virtual transformer |
| CN112865550A (en) * | 2021-04-12 | 2021-05-28 | 中国矿业大学 | Double-active-bridge converter with input connected in parallel and output connected in series and control method thereof |
| KR20210066438A (en) * | 2019-11-28 | 2021-06-07 | 한국전력공사 | Dual-Active-Bridge CONVERTER and BIPOLAR DC POWER DISTRIBUTION DEVICE |
| CN114123772A (en) * | 2021-11-15 | 2022-03-01 | 深圳供电局有限公司 | DAB type direct current transformer and distributed voltage-sharing control method thereof |
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| WO2016071701A1 (en) * | 2014-11-07 | 2016-05-12 | Kymab Limited | Treatment of disease using ligand binding to targets of interest |
| CN108809103A (en) * | 2018-06-05 | 2018-11-13 | 合肥工业大学 | The minimum current stress control method of the double active bridge DC-DC converters of cascade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20210066438A (en) * | 2019-11-28 | 2021-06-07 | 한국전력공사 | Dual-Active-Bridge CONVERTER and BIPOLAR DC POWER DISTRIBUTION DEVICE |
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| CN112117784A (en) * | 2020-08-28 | 2020-12-22 | 上海交通大学 | Operation control method of virtual transformer |
| CN112865550A (en) * | 2021-04-12 | 2021-05-28 | 中国矿业大学 | Double-active-bridge converter with input connected in parallel and output connected in series and control method thereof |
| CN114123772A (en) * | 2021-11-15 | 2022-03-01 | 深圳供电局有限公司 | DAB type direct current transformer and distributed voltage-sharing control method thereof |
| CN114123772B (en) * | 2021-11-15 | 2023-09-01 | 深圳供电局有限公司 | DAB type direct current transformer and distributed voltage equalizing control method thereof |
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